2 * boehm-gc.c: GC implementation using either the installed or included Boehm GC.
4 * Copyright 2001-2003 Ximian, Inc (http://www.ximian.com)
5 * Copyright 2004-2009 Novell, Inc (http://www.novell.com)
12 #define GC_I_HIDE_POINTERS
13 #include <mono/metadata/gc-internal.h>
14 #include <mono/metadata/mono-gc.h>
15 #include <mono/metadata/gc-internal.h>
16 #include <mono/metadata/profiler-private.h>
17 #include <mono/metadata/class-internals.h>
18 #include <mono/metadata/method-builder.h>
19 #include <mono/metadata/opcodes.h>
20 #include <mono/metadata/domain-internals.h>
21 #include <mono/metadata/metadata-internals.h>
22 #include <mono/metadata/marshal.h>
23 #include <mono/utils/mono-logger-internal.h>
24 #include <mono/utils/mono-time.h>
25 #include <mono/utils/dtrace.h>
26 #include <mono/utils/gc_wrapper.h>
30 #ifdef USE_INCLUDED_LIBGC
33 #define THREAD_LOCAL_ALLOC 1
34 #include "private/pthread_support.h"
37 #define GC_NO_DESCRIPTOR ((gpointer)(0 | GC_DS_LENGTH))
38 /*Boehm max heap cannot be smaller than 16MB*/
39 #define MIN_BOEHM_MAX_HEAP_SIZE_IN_MB 16
40 #define MIN_BOEHM_MAX_HEAP_SIZE (MIN_BOEHM_MAX_HEAP_SIZE_IN_MB << 20)
42 static gboolean gc_initialized = FALSE;
45 mono_gc_warning (char *msg, GC_word arg)
47 mono_trace (G_LOG_LEVEL_WARNING, MONO_TRACE_GC, msg, (unsigned long)arg);
51 mono_gc_base_init (void)
59 * Handle the case when we are called from a thread different from the main thread,
61 * FIXME: Move this to libgc where it belongs.
63 * we used to do this only when running on valgrind,
64 * but it happens also in other setups.
66 #if defined(HAVE_PTHREAD_GETATTR_NP) && defined(HAVE_PTHREAD_ATTR_GETSTACK)
71 pthread_getattr_np (pthread_self (), &attr);
72 pthread_attr_getstack (&attr, &sstart, &size);
73 pthread_attr_destroy (&attr);
74 /*g_print ("stackbottom pth is: %p\n", (char*)sstart + size);*/
77 * The calculation above doesn't seem to work on ia64, also we need to set
78 * GC_register_stackbottom as well, but don't know how.
81 /* apparently with some linuxthreads implementations sstart can be NULL,
82 * fallback to the more imprecise method (bug# 78096).
85 GC_stackbottom = (char*)sstart + size;
88 gsize stack_bottom = (gsize)&dummy;
90 stack_bottom &= ~4095;
91 GC_stackbottom = (char*)stack_bottom;
95 #elif defined(HAVE_PTHREAD_GET_STACKSIZE_NP) && defined(HAVE_PTHREAD_GET_STACKADDR_NP)
96 GC_stackbottom = (char*)pthread_get_stackaddr_np (pthread_self ());
97 #elif defined(__OpenBSD__)
98 # include <pthread_np.h>
103 rslt = pthread_stackseg_np(pthread_self(), &ss);
104 g_assert (rslt == 0);
106 GC_stackbottom = (char*)ss.ss_sp;
108 #elif defined(__native_client__)
109 /* Do nothing, GC_stackbottom is set correctly in libgc */
113 gsize stack_bottom = (gsize)&dummy;
114 stack_bottom += 4095;
115 stack_bottom &= ~4095;
116 /*g_print ("stackbottom is: %p\n", (char*)stack_bottom);*/
117 GC_stackbottom = (char*)stack_bottom;
121 #if !defined(PLATFORM_ANDROID)
122 /* If GC_no_dls is set to true, GC_find_limit is not called. This causes a seg fault on Android. */
126 GC_oom_fn = mono_gc_out_of_memory;
127 GC_set_warn_proc (mono_gc_warning);
128 GC_finalize_on_demand = 1;
129 GC_finalizer_notifier = mono_gc_finalize_notify;
131 #ifdef HAVE_GC_GCJ_MALLOC
132 GC_init_gcj_malloc (5, NULL);
135 #ifdef HAVE_GC_ALLOW_REGISTER_THREADS
136 GC_allow_register_threads();
139 if ((env = getenv ("MONO_GC_PARAMS"))) {
140 char **ptr, **opts = g_strsplit (env, ",", -1);
141 for (ptr = opts; *ptr; ++ptr) {
143 if (g_str_has_prefix (opt, "max-heap-size=")) {
146 opt = strchr (opt, '=') + 1;
147 if (*opt && mono_gc_parse_environment_string_extract_number (opt, &max_heap)) {
148 if (max_heap < MIN_BOEHM_MAX_HEAP_SIZE) {
149 fprintf (stderr, "max-heap-size must be at least %dMb.\n", MIN_BOEHM_MAX_HEAP_SIZE_IN_MB);
152 GC_set_max_heap_size (max_heap);
154 fprintf (stderr, "max-heap-size must be an integer.\n");
159 fprintf (stderr, "MONO_GC_PARAMS must be a comma-delimited list of one or more of the following:\n");
160 fprintf (stderr, " max-heap-size=N (where N is an integer, possibly with a k, m or a g suffix)\n");
167 mono_gc_enable_events ();
168 gc_initialized = TRUE;
173 * @generation: GC generation identifier
175 * Perform a garbage collection for the given generation, higher numbers
176 * mean usually older objects. Collecting a high-numbered generation
177 * implies collecting also the lower-numbered generations.
178 * The maximum value for @generation can be retrieved with a call to
179 * mono_gc_max_generation(), so this function is usually called as:
181 * mono_gc_collect (mono_gc_max_generation ());
184 mono_gc_collect (int generation)
186 MONO_PROBE_GC_BEGIN (generation);
188 mono_perfcounters->gc_induced++;
191 MONO_PROBE_GC_END (generation);
192 #if defined(ENABLE_DTRACE) && defined(__sun__)
193 /* This works around a dtrace -G problem on Solaris.
194 Limit its actual use to when the probe is enabled. */
195 if (MONO_PROBE_GC_END_ENABLED ())
201 * mono_gc_max_generation:
203 * Get the maximum generation number used by the current garbage
204 * collector. The value will be 0 for the Boehm collector, 1 or more
205 * for the generational collectors.
207 * Returns: the maximum generation number.
210 mono_gc_max_generation (void)
216 * mono_gc_get_generation:
217 * @object: a managed object
219 * Get the garbage collector's generation that @object belongs to.
220 * Use this has a hint only.
222 * Returns: a garbage collector generation number
225 mono_gc_get_generation (MonoObject *object)
231 * mono_gc_collection_count:
232 * @generation: a GC generation number
234 * Get how many times a garbage collection has been performed
235 * for the given @generation number.
237 * Returns: the number of garbage collections
240 mono_gc_collection_count (int generation)
246 * mono_gc_add_memory_pressure:
247 * @value: amount of bytes
249 * Adjust the garbage collector's view of how many bytes of memory
250 * are indirectly referenced by managed objects (for example unmanaged
251 * memory holding image or other binary data).
252 * This is a hint only to the garbage collector algorithm.
253 * Note that negative amounts of @value will decrease the memory
257 mono_gc_add_memory_pressure (gint64 value)
262 * mono_gc_get_used_size:
264 * Get the approximate amount of memory used by managed objects.
266 * Returns: the amount of memory used in bytes
269 mono_gc_get_used_size (void)
271 return GC_get_heap_size () - GC_get_free_bytes ();
275 * mono_gc_get_heap_size:
277 * Get the amount of memory used by the garbage collector.
279 * Returns: the size of the heap in bytes
282 mono_gc_get_heap_size (void)
284 return GC_get_heap_size ();
288 mono_gc_disable (void)
290 #ifdef HAVE_GC_ENABLE
293 g_assert_not_reached ();
298 mono_gc_enable (void)
300 #ifdef HAVE_GC_ENABLE
303 g_assert_not_reached ();
308 mono_gc_is_gc_thread (void)
310 #if GC_VERSION_MAJOR >= 7
312 #elif defined(USE_INCLUDED_LIBGC)
313 return GC_thread_is_registered ();
319 extern int GC_thread_register_foreign (void *base_addr);
322 mono_gc_register_thread (void *baseptr)
324 #if GC_VERSION_MAJOR >= 7
325 struct GC_stack_base sb;
328 res = GC_get_stack_base (&sb);
329 if (res != GC_SUCCESS) {
330 sb.mem_base = baseptr;
332 /* Can't determine the register stack bounds */
333 g_error ("mono_gc_register_thread failed ().\n");
336 res = GC_register_my_thread (&sb);
337 if ((res != GC_SUCCESS) && (res != GC_DUPLICATE)) {
338 g_warning ("GC_register_my_thread () failed.\n");
343 if (mono_gc_is_gc_thread())
345 #if defined(USE_INCLUDED_LIBGC) && !defined(HOST_WIN32)
346 return GC_thread_register_foreign (baseptr);
354 mono_object_is_alive (MonoObject* o)
356 #ifdef USE_INCLUDED_LIBGC
357 return GC_is_marked ((gpointer)o);
364 mono_gc_walk_heap (int flags, MonoGCReferences callback, void *data)
369 #ifdef USE_INCLUDED_LIBGC
371 static gint64 gc_start_time;
374 on_gc_notification (GCEventType event)
376 if (event == MONO_GC_EVENT_START) {
377 mono_perfcounters->gc_collections0++;
378 mono_stats.major_gc_count ++;
379 gc_start_time = mono_100ns_ticks ();
380 } else if (event == MONO_GC_EVENT_END) {
381 guint64 heap_size = GC_get_heap_size ();
382 guint64 used_size = heap_size - GC_get_free_bytes ();
383 mono_perfcounters->gc_total_bytes = used_size;
384 mono_perfcounters->gc_committed_bytes = heap_size;
385 mono_perfcounters->gc_reserved_bytes = heap_size;
386 mono_perfcounters->gc_gen0size = heap_size;
387 mono_stats.major_gc_time_usecs += (mono_100ns_ticks () - gc_start_time) / 10;
388 mono_trace_message (MONO_TRACE_GC, "gc took %d usecs", (mono_100ns_ticks () - gc_start_time) / 10);
390 mono_profiler_gc_event ((MonoGCEvent) event, 0);
394 on_gc_heap_resize (size_t new_size)
396 guint64 heap_size = GC_get_heap_size ();
397 mono_perfcounters->gc_committed_bytes = heap_size;
398 mono_perfcounters->gc_reserved_bytes = heap_size;
399 mono_perfcounters->gc_gen0size = heap_size;
400 mono_profiler_gc_heap_resize (new_size);
404 mono_gc_enable_events (void)
406 GC_notify_event = on_gc_notification;
407 GC_on_heap_resize = on_gc_heap_resize;
413 mono_gc_enable_events (void)
420 mono_gc_register_root (char *start, size_t size, void *descr)
422 /* for some strange reason, they want one extra byte on the end */
423 GC_add_roots (start, start + size + 1);
429 mono_gc_deregister_root (char* addr)
432 /* FIXME: libgc doesn't define this work win32 for some reason */
433 /* FIXME: No size info */
434 GC_remove_roots (addr, addr + sizeof (gpointer) + 1);
439 mono_gc_weak_link_add (void **link_addr, MonoObject *obj, gboolean track)
441 /* libgc requires that we use HIDE_POINTER... */
442 *link_addr = (void*)HIDE_POINTER (obj);
443 GC_GENERAL_REGISTER_DISAPPEARING_LINK (link_addr, obj);
447 mono_gc_weak_link_remove (void **link_addr)
449 GC_unregister_disappearing_link (link_addr);
454 reveal_link (gpointer link_addr)
456 void **link_a = link_addr;
457 return REVEAL_POINTER (*link_a);
461 mono_gc_weak_link_get (void **link_addr)
463 MonoObject *obj = GC_call_with_alloc_lock (reveal_link, link_addr);
464 if (obj == (MonoObject *) -1)
470 mono_gc_make_descr_for_string (gsize *bitmap, int numbits)
472 return mono_gc_make_descr_from_bitmap (bitmap, numbits);
476 mono_gc_make_descr_for_object (gsize *bitmap, int numbits, size_t obj_size)
478 return mono_gc_make_descr_from_bitmap (bitmap, numbits);
482 mono_gc_make_descr_for_array (int vector, gsize *elem_bitmap, int numbits, size_t elem_size)
484 /* libgc has no usable support for arrays... */
485 return GC_NO_DESCRIPTOR;
489 mono_gc_make_descr_from_bitmap (gsize *bitmap, int numbits)
491 #ifdef HAVE_GC_GCJ_MALLOC
492 /* It seems there are issues when the bitmap doesn't fit: play it safe */
494 return GC_NO_DESCRIPTOR;
496 return (gpointer)GC_make_descriptor ((GC_bitmap)bitmap, numbits);
503 mono_gc_make_root_descr_all_refs (int numbits)
509 mono_gc_alloc_fixed (size_t size, void *descr)
511 /* To help track down typed allocation bugs */
515 if (count == atoi (getenv ("COUNT2")))
517 if (count > atoi (getenv ("COUNT2")))
518 return GC_MALLOC (size);
522 return GC_MALLOC_EXPLICITLY_TYPED (size, (GC_descr)descr);
524 return GC_MALLOC (size);
528 mono_gc_free_fixed (void* addr)
533 mono_gc_invoke_finalizers (void)
535 /* There is a bug in GC_invoke_finalizer () in versions <= 6.2alpha4:
536 * the 'mem_freed' variable is not initialized when there are no
537 * objects to finalize, which leads to strange behavior later on.
538 * The check is necessary to work around that bug.
540 if (GC_should_invoke_finalizers ())
541 return GC_invoke_finalizers ();
546 mono_gc_pending_finalizers (void)
548 return GC_should_invoke_finalizers ();
552 * LOCKING: Assumes the domain_finalizers lock is held.
555 add_weak_track_handle_internal (MonoDomain *domain, MonoObject *obj, guint32 gchandle)
559 if (!domain->track_resurrection_objects_hash)
560 domain->track_resurrection_objects_hash = g_hash_table_new (mono_aligned_addr_hash, NULL);
562 refs = g_hash_table_lookup (domain->track_resurrection_objects_hash, obj);
563 refs = g_slist_prepend (refs, GUINT_TO_POINTER (gchandle));
564 g_hash_table_insert (domain->track_resurrection_objects_hash, obj, refs);
568 mono_gc_add_weak_track_handle (MonoObject *obj, guint32 handle)
575 domain = mono_object_get_domain (obj);
577 mono_domain_finalizers_lock (domain);
579 add_weak_track_handle_internal (domain, obj, handle);
581 g_hash_table_insert (domain->track_resurrection_handles_hash, GUINT_TO_POINTER (handle), obj);
583 mono_domain_finalizers_unlock (domain);
587 * LOCKING: Assumes the domain_finalizers lock is held.
590 remove_weak_track_handle_internal (MonoDomain *domain, MonoObject *obj, guint32 gchandle)
594 if (!domain->track_resurrection_objects_hash)
597 refs = g_hash_table_lookup (domain->track_resurrection_objects_hash, obj);
598 refs = g_slist_remove (refs, GUINT_TO_POINTER (gchandle));
599 g_hash_table_insert (domain->track_resurrection_objects_hash, obj, refs);
603 mono_gc_change_weak_track_handle (MonoObject *old_obj, MonoObject *obj, guint32 gchandle)
605 MonoDomain *domain = mono_domain_get ();
607 mono_domain_finalizers_lock (domain);
610 remove_weak_track_handle_internal (domain, old_obj, gchandle);
612 add_weak_track_handle_internal (domain, obj, gchandle);
614 mono_domain_finalizers_unlock (domain);
618 mono_gc_remove_weak_track_handle (guint32 gchandle)
620 MonoDomain *domain = mono_domain_get ();
623 /* Clean our entries in the two hashes in MonoDomain */
625 mono_domain_finalizers_lock (domain);
627 /* Get the original object this handle pointed to */
628 obj = g_hash_table_lookup (domain->track_resurrection_handles_hash, GUINT_TO_POINTER (gchandle));
630 g_hash_table_remove (domain->track_resurrection_handles_hash, GUINT_TO_POINTER (gchandle));
632 remove_weak_track_handle_internal (domain, obj, gchandle);
635 mono_domain_finalizers_unlock (domain);
639 mono_gc_remove_weak_track_object (MonoDomain *domain, MonoObject *obj)
643 if (domain->track_resurrection_objects_hash) {
644 refs = g_hash_table_lookup (domain->track_resurrection_objects_hash, obj);
648 * Since we don't run finalizers again for resurrected objects,
649 * no need to keep these around.
651 g_hash_table_remove (domain->track_resurrection_objects_hash, obj);
658 mono_gc_wbarrier_set_field (MonoObject *obj, gpointer field_ptr, MonoObject* value)
660 *(void**)field_ptr = value;
664 mono_gc_wbarrier_set_arrayref (MonoArray *arr, gpointer slot_ptr, MonoObject* value)
666 *(void**)slot_ptr = value;
670 mono_gc_wbarrier_arrayref_copy (gpointer dest_ptr, gpointer src_ptr, int count)
672 memmove (dest_ptr, src_ptr, count * sizeof (gpointer));
676 mono_gc_wbarrier_generic_store (gpointer ptr, MonoObject* value)
678 *(void**)ptr = value;
682 mono_gc_wbarrier_generic_nostore (gpointer ptr)
687 mono_gc_wbarrier_value_copy (gpointer dest, gpointer src, int count, MonoClass *klass)
689 memmove (dest, src, count * mono_class_value_size (klass, NULL));
693 mono_gc_wbarrier_object_copy (MonoObject* obj, MonoObject *src)
695 /* do not copy the sync state */
696 memcpy ((char*)obj + sizeof (MonoObject), (char*)src + sizeof (MonoObject),
697 mono_object_class (obj)->instance_size - sizeof (MonoObject));
701 mono_gc_clear_domain (MonoDomain *domain)
706 mono_gc_get_suspend_signal (void)
708 #ifdef USE_INCLUDED_GC
709 return GC_get_suspend_signal ();
715 #if defined(USE_INCLUDED_LIBGC) && defined(USE_COMPILER_TLS) && defined(__linux__) && (defined(__i386__) || defined(__x86_64__))
716 extern __thread MONO_TLS_FAST void* GC_thread_tls;
717 #include "metadata-internals.h"
723 while (!(v & (1 << i)))
730 ATYPE_FREEPTR_FOR_BOX,
738 create_allocator (int atype, int offset)
740 int index_var, bytes_var, my_fl_var, my_entry_var;
741 guint32 no_freelist_branch, not_small_enough_branch = 0;
742 guint32 size_overflow_branch = 0;
743 MonoMethodBuilder *mb;
745 MonoMethodSignature *csig;
746 AllocatorWrapperInfo *info;
748 if (atype == ATYPE_STRING) {
749 csig = mono_metadata_signature_alloc (mono_defaults.corlib, 2);
750 csig->ret = &mono_defaults.string_class->byval_arg;
751 csig->params [0] = &mono_defaults.int_class->byval_arg;
752 csig->params [1] = &mono_defaults.int32_class->byval_arg;
754 csig = mono_metadata_signature_alloc (mono_defaults.corlib, 1);
755 csig->ret = &mono_defaults.object_class->byval_arg;
756 csig->params [0] = &mono_defaults.int_class->byval_arg;
759 mb = mono_mb_new (mono_defaults.object_class, "Alloc", MONO_WRAPPER_ALLOC);
760 bytes_var = mono_mb_add_local (mb, &mono_defaults.int32_class->byval_arg);
761 if (atype == ATYPE_STRING) {
762 /* a string alloator method takes the args: (vtable, len) */
763 /* bytes = (sizeof (MonoString) + ((len + 1) * 2)); */
764 mono_mb_emit_ldarg (mb, 1);
765 mono_mb_emit_icon (mb, 1);
766 mono_mb_emit_byte (mb, MONO_CEE_ADD);
767 mono_mb_emit_icon (mb, 1);
768 mono_mb_emit_byte (mb, MONO_CEE_SHL);
769 // sizeof (MonoString) might include padding
770 mono_mb_emit_icon (mb, G_STRUCT_OFFSET (MonoString, chars));
771 mono_mb_emit_byte (mb, MONO_CEE_ADD);
772 mono_mb_emit_stloc (mb, bytes_var);
774 /* bytes = vtable->klass->instance_size */
775 mono_mb_emit_ldarg (mb, 0);
776 mono_mb_emit_icon (mb, G_STRUCT_OFFSET (MonoVTable, klass));
777 mono_mb_emit_byte (mb, MONO_CEE_ADD);
778 mono_mb_emit_byte (mb, MONO_CEE_LDIND_I);
779 mono_mb_emit_icon (mb, G_STRUCT_OFFSET (MonoClass, instance_size));
780 mono_mb_emit_byte (mb, MONO_CEE_ADD);
781 /* FIXME: assert instance_size stays a 4 byte integer */
782 mono_mb_emit_byte (mb, MONO_CEE_LDIND_U4);
783 mono_mb_emit_stloc (mb, bytes_var);
786 /* this is needed for strings/arrays only as the other big types are never allocated with this method */
787 if (atype == ATYPE_STRING) {
789 /* if (!SMALL_ENOUGH (bytes)) jump slow_path;*/
790 mono_mb_emit_ldloc (mb, bytes_var);
791 mono_mb_emit_icon (mb, (NFREELISTS-1) * GRANULARITY);
792 not_small_enough_branch = mono_mb_emit_short_branch (mb, MONO_CEE_BGT_UN_S);
793 /* check for overflow */
794 mono_mb_emit_ldloc (mb, bytes_var);
795 mono_mb_emit_icon (mb, sizeof (MonoString));
796 size_overflow_branch = mono_mb_emit_short_branch (mb, MONO_CEE_BLE_UN_S);
799 /* int index = INDEX_FROM_BYTES(bytes); */
800 index_var = mono_mb_add_local (mb, &mono_defaults.int32_class->byval_arg);
802 mono_mb_emit_ldloc (mb, bytes_var);
803 mono_mb_emit_icon (mb, GRANULARITY - 1);
804 mono_mb_emit_byte (mb, MONO_CEE_ADD);
805 mono_mb_emit_icon (mb, shift_amount (GRANULARITY));
806 mono_mb_emit_byte (mb, MONO_CEE_SHR_UN);
807 mono_mb_emit_icon (mb, shift_amount (sizeof (gpointer)));
808 mono_mb_emit_byte (mb, MONO_CEE_SHL);
809 /* index var is already adjusted into bytes */
810 mono_mb_emit_stloc (mb, index_var);
812 my_fl_var = mono_mb_add_local (mb, &mono_defaults.int_class->byval_arg);
813 my_entry_var = mono_mb_add_local (mb, &mono_defaults.int_class->byval_arg);
814 /* my_fl = ((GC_thread)tsd) -> ptrfree_freelists + index; */
815 mono_mb_emit_byte (mb, MONO_CUSTOM_PREFIX);
816 mono_mb_emit_byte (mb, 0x0D); /* CEE_MONO_TLS */
817 mono_mb_emit_i4 (mb, offset);
818 if (atype == ATYPE_FREEPTR || atype == ATYPE_FREEPTR_FOR_BOX || atype == ATYPE_STRING)
819 mono_mb_emit_icon (mb, G_STRUCT_OFFSET (struct GC_Thread_Rep, ptrfree_freelists));
820 else if (atype == ATYPE_NORMAL)
821 mono_mb_emit_icon (mb, G_STRUCT_OFFSET (struct GC_Thread_Rep, normal_freelists));
822 else if (atype == ATYPE_GCJ)
823 mono_mb_emit_icon (mb, G_STRUCT_OFFSET (struct GC_Thread_Rep, gcj_freelists));
825 g_assert_not_reached ();
826 mono_mb_emit_byte (mb, MONO_CEE_ADD);
827 mono_mb_emit_ldloc (mb, index_var);
828 mono_mb_emit_byte (mb, MONO_CEE_ADD);
829 mono_mb_emit_stloc (mb, my_fl_var);
831 /* my_entry = *my_fl; */
832 mono_mb_emit_ldloc (mb, my_fl_var);
833 mono_mb_emit_byte (mb, MONO_CEE_LDIND_I);
834 mono_mb_emit_stloc (mb, my_entry_var);
836 /* if (EXPECT((word)my_entry >= HBLKSIZE, 1)) { */
837 mono_mb_emit_ldloc (mb, my_entry_var);
838 mono_mb_emit_icon (mb, HBLKSIZE);
839 no_freelist_branch = mono_mb_emit_short_branch (mb, MONO_CEE_BLT_UN_S);
841 /* ptr_t next = obj_link(my_entry); *my_fl = next; */
842 mono_mb_emit_ldloc (mb, my_fl_var);
843 mono_mb_emit_ldloc (mb, my_entry_var);
844 mono_mb_emit_byte (mb, MONO_CEE_LDIND_I);
845 mono_mb_emit_byte (mb, MONO_CEE_STIND_I);
847 /* set the vtable and clear the words in the object */
848 mono_mb_emit_ldloc (mb, my_entry_var);
849 mono_mb_emit_ldarg (mb, 0);
850 mono_mb_emit_byte (mb, MONO_CEE_STIND_I);
852 if (atype == ATYPE_FREEPTR) {
853 int start_var, end_var, start_loop;
854 /* end = my_entry + bytes; start = my_entry + sizeof (gpointer);
856 start_var = mono_mb_add_local (mb, &mono_defaults.int_class->byval_arg);
857 end_var = mono_mb_add_local (mb, &mono_defaults.int_class->byval_arg);
858 mono_mb_emit_ldloc (mb, my_entry_var);
859 mono_mb_emit_ldloc (mb, bytes_var);
860 mono_mb_emit_byte (mb, MONO_CEE_ADD);
861 mono_mb_emit_stloc (mb, end_var);
862 mono_mb_emit_ldloc (mb, my_entry_var);
863 mono_mb_emit_icon (mb, G_STRUCT_OFFSET (MonoObject, synchronisation));
864 mono_mb_emit_byte (mb, MONO_CEE_ADD);
865 mono_mb_emit_stloc (mb, start_var);
869 * } while (start < end);
871 start_loop = mono_mb_get_label (mb);
872 mono_mb_emit_ldloc (mb, start_var);
873 mono_mb_emit_icon (mb, 0);
874 mono_mb_emit_byte (mb, MONO_CEE_STIND_I);
875 mono_mb_emit_ldloc (mb, start_var);
876 mono_mb_emit_icon (mb, sizeof (gpointer));
877 mono_mb_emit_byte (mb, MONO_CEE_ADD);
878 mono_mb_emit_stloc (mb, start_var);
880 mono_mb_emit_ldloc (mb, start_var);
881 mono_mb_emit_ldloc (mb, end_var);
882 mono_mb_emit_byte (mb, MONO_CEE_BLT_UN_S);
883 mono_mb_emit_byte (mb, start_loop - (mono_mb_get_label (mb) + 1));
884 } else if (atype == ATYPE_FREEPTR_FOR_BOX || atype == ATYPE_STRING) {
885 /* need to clear just the sync pointer */
886 mono_mb_emit_ldloc (mb, my_entry_var);
887 mono_mb_emit_icon (mb, G_STRUCT_OFFSET (MonoObject, synchronisation));
888 mono_mb_emit_byte (mb, MONO_CEE_ADD);
889 mono_mb_emit_icon (mb, 0);
890 mono_mb_emit_byte (mb, MONO_CEE_STIND_I);
893 if (atype == ATYPE_STRING) {
894 /* need to set length and clear the last char */
895 /* s->length = len; */
896 mono_mb_emit_ldloc (mb, my_entry_var);
897 mono_mb_emit_icon (mb, G_STRUCT_OFFSET (MonoString, length));
898 mono_mb_emit_byte (mb, MONO_CEE_ADD);
899 mono_mb_emit_ldarg (mb, 1);
900 mono_mb_emit_byte (mb, MONO_CEE_STIND_I4);
901 /* s->chars [len] = 0; */
902 mono_mb_emit_ldloc (mb, my_entry_var);
903 mono_mb_emit_ldloc (mb, bytes_var);
904 mono_mb_emit_icon (mb, 2);
905 mono_mb_emit_byte (mb, MONO_CEE_SUB);
906 mono_mb_emit_byte (mb, MONO_CEE_ADD);
907 mono_mb_emit_icon (mb, 0);
908 mono_mb_emit_byte (mb, MONO_CEE_STIND_I2);
911 /* return my_entry; */
912 mono_mb_emit_ldloc (mb, my_entry_var);
913 mono_mb_emit_byte (mb, MONO_CEE_RET);
915 mono_mb_patch_short_branch (mb, no_freelist_branch);
916 if (not_small_enough_branch > 0)
917 mono_mb_patch_short_branch (mb, not_small_enough_branch);
918 if (size_overflow_branch > 0)
919 mono_mb_patch_short_branch (mb, size_overflow_branch);
920 /* the slow path: we just call back into the runtime */
921 if (atype == ATYPE_STRING) {
922 mono_mb_emit_ldarg (mb, 1);
923 mono_mb_emit_icall (mb, mono_string_alloc);
925 mono_mb_emit_ldarg (mb, 0);
926 mono_mb_emit_icall (mb, mono_object_new_specific);
929 mono_mb_emit_byte (mb, MONO_CEE_RET);
931 res = mono_mb_create_method (mb, csig, 8);
933 mono_method_get_header (res)->init_locals = FALSE;
935 info = mono_image_alloc0 (mono_defaults.corlib, sizeof (AllocatorWrapperInfo));
936 info->gc_name = "boehm";
937 info->alloc_type = atype;
938 mono_marshal_set_wrapper_info (res, info);
943 static MonoMethod* alloc_method_cache [ATYPE_NUM];
946 * If possible, generate a managed method that can quickly allocate objects in class
947 * @klass. The method will typically have an thread-local inline allocation sequence.
948 * The signature of the called method is:
949 * object allocate (MonoVTable *vtable)
950 * Some of the logic here is similar to mono_class_get_allocation_ftn () i object.c,
952 * The thread local alloc logic is taken from libgc/pthread_support.c.
956 mono_gc_get_managed_allocator (MonoVTable *vtable, gboolean for_box)
960 MonoClass *klass = vtable->klass;
961 MONO_THREAD_VAR_OFFSET (GC_thread_tls, offset);
963 /*g_print ("thread tls: %d\n", offset);*/
966 if (!SMALL_ENOUGH (klass->instance_size))
968 if (mono_class_has_finalizer (klass) || klass->marshalbyref || (mono_profiler_get_events () & MONO_PROFILE_ALLOCATIONS))
972 if (klass->byval_arg.type == MONO_TYPE_STRING) {
973 atype = ATYPE_STRING;
974 } else if (!klass->has_references) {
976 atype = ATYPE_FREEPTR_FOR_BOX;
978 atype = ATYPE_FREEPTR;
982 * disabled because we currently do a runtime choice anyway, to
983 * deal with multiple appdomains.
984 if (vtable->gc_descr != GC_NO_DESCRIPTOR)
987 atype = ATYPE_NORMAL;
990 return mono_gc_get_managed_allocator_by_type (atype);
994 mono_gc_get_managed_array_allocator (MonoVTable *vtable, int rank)
1000 * mono_gc_get_managed_allocator_by_type:
1002 * Return a managed allocator method corresponding to allocator type ATYPE.
1005 mono_gc_get_managed_allocator_by_type (int atype)
1009 MONO_THREAD_VAR_OFFSET (GC_thread_tls, offset);
1011 mono_loader_lock ();
1012 res = alloc_method_cache [atype];
1014 res = alloc_method_cache [atype] = create_allocator (atype, offset);
1015 mono_loader_unlock ();
1020 mono_gc_get_managed_allocator_types (void)
1026 mono_gc_get_write_barrier (void)
1028 g_assert_not_reached ();
1035 mono_gc_get_managed_allocator (MonoVTable *vtable, gboolean for_box)
1041 mono_gc_get_managed_array_allocator (MonoVTable *vtable, int rank)
1047 mono_gc_get_managed_allocator_by_type (int atype)
1053 mono_gc_get_managed_allocator_types (void)
1059 mono_gc_get_write_barrier (void)
1061 g_assert_not_reached ();
1068 mono_gc_get_gc_name (void)
1074 mono_gc_invoke_with_gc_lock (MonoGCLockedCallbackFunc func, void *data)
1076 return GC_call_with_alloc_lock (func, data);
1080 mono_gc_get_description (void)
1082 return g_strdup (DEFAULT_GC_NAME);
1086 mono_gc_set_desktop_mode (void)
1092 mono_gc_is_moving (void)
1098 mono_gc_is_disabled (void)
1100 if (GC_dont_gc || g_getenv ("GC_DONT_GC"))
1107 mono_gc_wbarrier_value_copy_bitmap (gpointer _dest, gpointer _src, int size, unsigned bitmap)
1109 g_assert_not_reached ();
1114 mono_gc_get_card_table (int *shift_bits, gpointer *card_mask)
1116 g_assert_not_reached ();
1121 mono_gc_get_nursery (int *shift_bits, size_t *size)
1127 mono_gc_precise_stack_mark_enabled (void)
1133 mono_gc_get_logfile (void)
1139 mono_gc_conservatively_scan_area (void *start, void *end)
1141 g_assert_not_reached ();
1145 mono_gc_scan_object (void *obj)
1147 g_assert_not_reached ();
1152 mono_gc_get_bitmap_for_descr (void *descr, int *numbits)
1154 g_assert_not_reached ();
1159 mono_gc_set_gc_callbacks (MonoGCCallbacks *callbacks)
1164 * These will call the redefined versions in libgc.
1170 mono_gc_pthread_create (pthread_t *new_thread, const pthread_attr_t *attr, void *(*start_routine)(void *), void *arg)
1172 return pthread_create (new_thread, attr, start_routine, arg);
1176 mono_gc_pthread_join (pthread_t thread, void **retval)
1178 return pthread_join (thread, retval);
1182 mono_gc_pthread_detach (pthread_t thread)
1184 return pthread_detach (thread);
1190 BOOL APIENTRY mono_gc_dllmain (HMODULE module_handle, DWORD reason, LPVOID reserved)
1192 #ifdef USE_INCLUDED_LIBGC
1193 return GC_DllMain (module_handle, reason, reserved);
1200 #endif /* no Boehm GC */